TeX Resources

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LuaTeX is based on Unicode and
embeds Lua (a scripting language) and MetaPost to permit operations not
easily accomplished with the basic TeX engine; v1.0 was released in
late 2016 and included in TeX Live 2017.

Other TeX Resources

CTAN -- the Comprehensive TeX Archive Network, with mirrors around
the world.
Use the CTAN search facility to look for the name of a file you need.

TLContrib -- an archive of
contributed packages which, for various reasons, cannot be distributed
in TeX Live (not free according to FSF guidelines, not available on CTAN,
intermediate release for testing, ...)